Why slices are used in Go - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a slice of integers.

Go

var numbers [1]

Drag options to blanks, or click blank then click option'

Aint

B[5]int

Cmap[int]int

D[]int

Attempts:

3 left

💡 Hint

Common Mistakes

Using [5]int declares an array, not a slice.

Using int alone is just a single integer, not a slice.

In Go, slices are declared using [] followed by the type, like []int for a slice of integers.

2fill in blank

medium

Complete the code to create a slice from an array.

Go

arr := [5]int{1, 2, 3, 4, 5}
slice := arr[1]

Drag options to blanks, or click blank then click option'

A[1:4]

B[1]

C[:]

D[5]

Attempts:

3 left

💡 Hint

Common Mistakes

Using arr[1] returns a single element, not a slice.

Using arr[:] returns the whole array as a slice.

To create a slice from an array, use the slice expression with start and end indices like arr[1:4].

3fill in blank

hard

Fix the error in the code to append an element to a slice.

Go

var s []int
s = append(s, [1])

Drag options to blanks, or click blank then click option'

A5

B"5"

Cs

Dappend

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of an int causes a type error.

Trying to append the slice itself or the append function is incorrect.

The append function adds an integer value to the slice. The value must be an int, not a string.

4fill in blank

hard

Fill both blanks to create a slice with make and set its length.

Go

s := make([1], [2])

Drag options to blanks, or click blank then click option'

A[]int

B5

C10

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using int instead of []int for the slice type.

Confusing length with capacity.

The make function creates a slice of type []int with length 5.

5fill in blank

hard

Fill all three blanks to create a slice from an array and append a value.

Go

arr := [4]int{1, 2, 3, 4}
s := arr[1]
length := len(s) + [3]
s = append(s, [2])

Drag options to blanks, or click blank then click option'

A[1:3]

B5

C1

D[0:2]

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong slice indices that cause out of range errors.

Not updating length correctly after append.

The slice s is created from arr[1:3], then 5 is appended. The length is increased by 1 after append.